Contact-pin for circuit-closing members.



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CONTACT PIP.' FR CHCUT CLOSING WiEFfSEHS.

APPUCATIOH mw APs/25.1912.

Paen'edept. 5, 1916.

Linares.

reafirmar ernten ALFRED A. ZIEGLER, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO UN'IEID ELECTRIC APIARATUS CO., OF BOSTN, MASSACHUSETTS, A CORFORATION OF MASSACHU- SETTS.

CONTACT-PN FOR CIRCUT-CLOSING MEMBERS.

Specification of Letters Patent.

rginal application led February 18, i910, Serial No. 544,530. Divided and this application niet). April To all 'whom t may concern:

Be it known that I, ALFRED Zlnonnn, a citizen of the United States, residing at Boston, in the county of Sutl'olh and State of Massachusetts, have invented an improvement in Contact-Pins` Jfor Circuit-Closing Members, of which the followingis a speci-l ication. l

This invention relates to circuit-closing devices and particularly to thefcontactpins, and has for its object the formation of a contactepin of a single piece oWire, such as platinum7 comprising a body and a head with a flat end, said head being larger 1n diameter than the body, and the pin being trictionally-secured in a hol-e in the circuitclosing member with its head projecting therefrom, and engaging the surface of the member. I

The present invention. involves a contactpin which is formed and secured to the meinloerl at one and the same operation.v Such a contactpin is not liable to cause troubleA as it cannot Work loose and is Well suited for electric devices Which are subjected to rough usage.

Figure 1 is a side elevation of a circuitclosing device, the members of which have contact-pins embodying this invention. Fig.

2 is a transverse section ot one of' the circuit-closing members having a short piece of Wire projecting through a hole therein and illustrating the.lirst step of :forming and securing the contact-pins to the member. Fig'. 3 is a similar View7 the wire having been subjected to endwise pressure by dies to form the contact-pin and rictionally secure it to the member. Figa is a vertical section ot another-circuit-elosing member having a hole in the end of its shank and a short piece of Wire inserted in said hole, .thus illustrating the ti, st step of forming and. securing the contact-pin. Fig. 5 is a similar view, the Wire having been subjected to endwise pressure by dies to ,torin the Contact pin and secure it to the circuit-closing member.

Referring to Fig. 1- of the drawings, which illustrates one form of an electrical device to which my improved form of contact-'pin is applicable, a represents the base-plate, Z) a resilient circuit-closing member, d a bracket arranged on the base-plate through which a screw d extends, which is located Serial No. 693,120.

above the member b, and a` post setin the base-plate beneath the member t), said member being movable between the screw and the post. Contact-pins embodying my invention are arranged in the member b, and in the screw, and may be arranged inthe post. I

Referring to Figs. 2 and 3 the member Z is shown having a hole through it for the contact-pin. in Fig. 2 b represents a short piece of metal, as wire, for instance, which is extended through the hole in the member Z), its ends projecting from both sides of the member. Said single piece of metal 3 is then subjected to endwise pressure by dies, which, by a swaging or equivalent action slightly enlargethe portion of the wire which is in the hole to cause it to snugly tit said hole and substantially 4enlarge the projecting endportions of the wire to form cylindrical heads at each end olf the wire, outside of the hole, each head having a fiat end. The contact-pin thus formed trictionally engages the wall ot' the hole in the niember and the heads abut against the upper and under sides of said'member, and as a result it is very securely attached to the member Z. Forming and securing the contactpin thus takes place at one and the saine operation. v

Referring to Figs. il and 5 a circuit-closing member shownas a screw Il is shown, having a hole in the end of its shank for 'the 'contact-pin, andsaid pin is formed and secured therein in substantially the same manner as l'ieretoiore described, that is to say, a short piece of wire cl is inserted in the hole and subjected to severe endwise pressure by a die, which slightly expands the portion contained. in the hole, in order that it may lrictionally engage the wall of the hole and also forms a circular head with a fiat end at the end ot the screw, said head being .j vlarger in diameter than the port1on contained in the hole. This contact-pin, lilol the atore said, contact-pin, is formed' and secured at one and the same operation.

From the foregoing it is obvious that the contact-pin may be formed and secured to any other form ot circuitclosing member than that here shown.

l claim Patented Slept. it,

A circuit closing member having a hole closed at the bottom and a contact pin therewithin the member, the headl of the pin en` for ooniposed of an integral metallic section including an elongated body and a circular vheard larger than the body and having a free 4fiat face concentric with the surface of the body, the body of the pin completely filling and being frctionally lhelol Within the hole gaging the surface of the member adjacent the hole and presenting an area of greater diameter than, and concentric with the body whereby the continuel blows on the head inname to this specification in the presence of two subscribing Witnesses.

ALFRED A. ZIEGLER.

Witnesses B.` J. Noyes, H. B. DAVIS. 

